WML:preload(3)            mp4h packages            WML:preload(3)



NAME
       WML:preload - Preload Images

SYNOPSIS
        <use WML:preload />

        <preload src="image filename" via="trick" />


DESCRIPTION
       This include file provides the "<preload>" tag which can
       be used to preload images. Such preloading is usually done
       to speedup access for following pages. Currently there are
       only a few tricks how this can be done.

       The following combinations are currently supported:

       "src="anyimage "via=size"
           Preloads the image anyimage by using an "<img>" tag
           with the attributes "width=1 height=1" which leads to
           the loading of the image but only to a 1 pixel in dis-
           play.

           Advantage: Works for all browsers.

           Disadvantage: This approach has the nasty side-effect
           of an occuring 1 pixel in display because "width=0
           height=0" does not work as expected in most browsers
           (especially in Netscape 4.x). So, position your
           "<preload>" tag somewhere it does not destroy the look
           and feel of your page.

       "src="anyimage "via=js"
           Preloads the image anyimage by using a JavaScript
           snippet which loads the image by declaring an unused
           "Image" object.

           Advantage: Silently preloads the image without dis-
           playing anything.

           Disadvantage: Only works for browsers with a
           JavaScript implementation and only for those who sup-
           port the "Image" object (currently NS/3, NS/4, IE/4).

AUTHORS
        Ralf S. Engelschall
        rse@engelschall.com
        www.engelschall.com

        Denis Barbier
        barbier@imacs.polytechnique.fr




mp4h packages               2002-03-06             WML:preload(3)